185458-45-1Relevant academic research and scientific papers
Mixed bent sandwich titanium complexes with the [2-(diisopropylamino)ethyl]cyclopentadienyl ligand - catalysts for the polymerization of ethylene and the dehydrocoupling of phenylsilane
Jutzi, Peter,Redeker, Thomas,Neumann, Beate,Stammler, Hans-Georg
, p. 1509 - 1515 (2007/10/03)
Mixed bent sandwich titanium(IV) complexes containing the donor-substituted [2-{diisopropylamino)ethyl]cyclopentadienyl (C5H4CH2CH2NjPr2 = CpN) ligand are described. The highly moisture-sensitive metallocene dichloride (C5H4CH2CH2NN;Pr2)(C 5H4SiMe3)TiCl2 (1) was synthesized by reaction of CpNLi with CpSTiCl3 (CpS ≡ C5H4SiMe3). Complex 1 reacts with one equivalent of HC1 with protonation of the amino group to give the air- and water-stable metallocene dichloride-hydrochloride [(C5H4CH2CH2-N(H)/Pr 2)(C5H4SiMe3)TiCl2] + Cl- (2). The structure of 2 was determined by a single-crystal X-ray diffraction study. Com-pounds 1 and 2 are precursors for ethylene polymerization catalysts. The reaction of 2 with one equivalent of Na+B[3,5-(CF3)2C6H3] 4- afforded the borate [(C5H4CH2CH2N(H)jPr 2)-{C5H4SiMe3)TiCl 2rB[3,5-(CF3)2C6H3] 4- (3). The dimethyl compound (C5H4CM2CH2NJPr2)(C 5H4SiMe3)TiMe2 (4) was obtained by reaction of 1 with two equivalents of methyllithium. The diphenoxy complex (C5H4CH2CH2-N/Pr2 2)(C5H4SiMe3)Ti(OPh)2 (5) was prepared analogously with a stoichiometric amount of lithium phenoxide. Compounds 4 and 5 show remarkable activity in the catalytic dehydrocoupling of phenylsilane. VCH Verlagsgesellschaft mbH, 1996.
